Main feature map for Claude Code

This document continues the reverse-engineering analysis of Claude Code. Its goal is to answer a product/runtime question: what major capabilities are implemented by cli.renamed.js, and how do those capabilities connect?

The file is bundled/minified production JavaScript. The document therefore uses semantic aliases such as OuterBootstrap, CommanderRoot, HeadlessRunner, InteractiveSessionLoop, McpCoordinator, SessionRestorer, and RemoteControlBridge. Minified names are secondary search handles; exact strings below anchor this @anthropic-ai/claude-code@2.1.215 build.

Executive summary

cli.renamed.js is not a thin prompt wrapper. It is the main Claude Code agent runtime. Its outer ZIS() router selects version output, internal hosts/helpers, bridge, daemon/background, fleet, or normal CLI startup; the normal UkS() → jkS() path then parses the command surface and composes interactive/headless/remote sessions. The bundle also loads settings and managed policy, initializes authentication and model/provider state, manages sessions, assembles tools, applies permissions, loads MCP servers and plugins, orchestrates custom and background agents, and handles accessibility, observability, updates, and coordinated shutdown.

The 2.1.215 snapshot adds several source-confirmed surfaces that were absent from the previous 2.1.143 documentation baseline: Sonnet 5, Opus 4.8, and Fable 5 model records; the Workflow tool and /workflows UI; background-by-default and nested subagents; experimental observer agents and Agent Teams; the gated EndConversation lifecycle; /fork background copies plus /subtask; session-bound Projects knowledge, Artifact publishing, and Claude Design/design-system sync; screen-reader and safe modes; MCP tool refresh/auto-backgrounding; richer hooks and telemetry; and hard per-session WebSearch/subagent budgets. The second-round audit also promotes two substantial older-but-underdocumented subsystems—macOS computer-use MCP and /team-onboarding guide sharing—without misclassifying them as new package deltas.

Two useful lenses for the runtime are context engineering and harness engineering:

• Context engineering decides what the model can see: system prompts, CLAUDE.md, settings, output styles, tools, agents, MCP prompts/resources, memories, file inputs, and session history.
• Harness engineering decides how the model is embedded in a usable coding-agent runtime: modes, sessions, tools, permissions, hooks, streaming, retries, remote control, telemetry, and update behavior.

Source anchors

Area	Semantic alias	Minified anchor / exact string	Role
Build identity	AnalyzedBuild	VERSION: "2.1.215", BUILD_TIME: "2026-07-19T00:01:04Z"	Pins every generated/minified anchor to one package build.
Bootstrap/Commander	OuterBootstrap / CommanderRoot	ZIS(), UkS(), jkS(), Claude Code - starts an interactive session by default, --print	Routes specialized processes before the normal main, then builds/parses the ordinary command surface.
Headless	HeadlessRunner	--output-format=stream-json, control_request, prompt_suggestion	Runs print/SDK stream-JSON mode and drains control/message loops.
Interactive/accessibility	InteractiveSessionLoop	--ax-screen-reader, CLAUDE_AX_SCREEN_READER, /resume	Runs the TUI/session loop, picker, and flat accessibility renderer.
Conversation termination	EndConversationTool	EndConversation, ended-by-model, tengu_umber_kestrel	Reflects twice, persists terminal state, aborts the turn, and blocks resumed work.
MCP	McpCoordinator	tools/list, roots/list, notifications/roots/list_changed, keeping previous tools, RefreshMcpTools	Connects MCP servers, publishes roots, and preserves last-good capability fields when a list-change refresh fails.
Background daemon	DaemonSupervisor	krm(), BG_PROTO = 1, controlRequest, lease	Supervises background handles through a versioned/authenticated newline-delimited local control protocol and transient keep-alive leases.
Enterprise gateway	GatewayServer	claude gateway --config, startGateway(), /oauth/device_authorization, /v1/messages, /managed/settings	Runs a native-only corporate auth/inference/policy/spend/OTLP gateway.
Native computer control	ComputerUseMcpServer	computer-use, request_access, computer-use.lock	Controls approved macOS applications through a session-wired MCP and layered native policy.
Sessions	SessionRestorer	transcriptSource:"local-jsonl", --resume, --fork-session	Finds recent sessions and restores or forks transcript state.
Tools/workflows	BuiltInToolNames	Bash, Read, Edit, WebFetch, WebSearch, Agent, Workflow, RefreshMcpTools	Core coding, delegation, orchestration, and integration capabilities.
Hosted knowledge	ProjectsTool	CLAUDE_PROJECT_UUID, project_info, project_search, project_write	Binds one session to one durable claude.ai Project knowledge container.
Hosted creation	ArtifactTool, DesignTool, DesignSyncTool	Artifact, ClaudeDesign, DesignSync	Publishes versioned pages and edits/synchronizes collaborative design projects under account/policy gates.
Hosted onboarding	TeamOnboardingSkill, ShareOnboardingGuideTool	/team-onboarding, ONBOARDING.md, allow_team_onboarding	Summarizes bounded local usage into a guide and optionally maintains an organization share link.
Observer automation	ObserverPairingRegistry	observer, observer-ref, ObserverReport	Auto-spawns read-only observers, resumes pairings, and delivers one-way advice.
Hooks	HookEvents	PreToolUse, PostToolBatch, MessageDisplay, SessionStart, TaskCreated	Authorization, display, lifecycle, task, and automation event surface.
Ops/recovery	TrafficAndDebugGates	CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC, --safe-mode, CLAUDE_CODE_SAFE_MODE	Debug/traffic policy plus configuration-isolation recovery.

Runtime system map

flowchart TB
    Cli[cli.js bundled runtime] --> Bootstrap[Bootstrap and command surface]
    Bootstrap --> Specialized[Internal hosts / bridge / daemon / background]
    Cli --> Modes[Runtime modes]
    Cli --> Context[Context and model loop]
    Cli --> Tools[Tools and permissions]
    Cli --> Sessions[Sessions and persistence]
    Cli --> Integrations[MCP / plugins / IDE / Chrome]
    Cli --> Agents[Agents and automation]
    Cli --> Ops[Diagnostics / telemetry / update]
    Cli --> Accessibility[Screen reader / safe mode]

    Bootstrap --> Commands[auth / mcp / plugin / project / agents / doctor / update / install]

    Modes --> TUI[Interactive TUI]
    Modes --> Headless[Print / SDK stream JSON]
    Modes --> Remote[Remote / teleport / Remote Control]

    Context --> Prompt[CLAUDE.md / settings / system prompt / output styles]
    Context --> Models[Auth / models / providers]
    Context --> Stream[Provider request and streaming response]

    Tools --> Builtins[Built-in coding tools]
    Tools --> Policy[Allow/deny / permission mode / hooks]
    Tools --> External[MCP tools / plugins / browser / IDE]

    Sessions --> Jsonl[local-jsonl transcripts]
    Sessions --> Resume[resume / continue / fork / rewind]
    Sessions --> Bridge[remote session ingress]

    Agents --> Custom[custom agents]
    Agents --> Task[Task and background agent commands]
    Agents --> Teams[Agent Teams roster / tasks / mailboxes]
    Agents --> Review[ultrareview / auto-mode]
    Agents --> Workflows[Workflow tool / ultracode / workflows view]
    Specialized --> Daemon[Local background supervisor]

Major feature matrix

Feature area	Entry point or trigger	Main capabilities	Primary docs
Package/Bun startup	Native Bun standalone artifact, .bun graph entrypoint	Extracted graph identifies the CLI entrypoint and embedded image/audio N-API modules; exact wrapper-to-native handoff is not retained in this checkout.	Package and Bun bootstrap
CLI command shell	claude, root flags, subcommands	Version, root mode dispatch, auth, mcp, plugin, project, agents, doctor, update, install.	Command-line reference
Background supervisor	daemon/background routes, claude agents, leases/control socket	On-demand or gated service-origin supervisor, worker adoption, dispatch/attach/reply/kill, idle/takeover, and local protocol checks.	Daemon and background service
Interactive mode	Default TTY run	Setup/login/trust screens, TUI root, resume picker, tools/agents/MCP load, and the interactive session loop.	CLI main paths
Conversation termination	Gated EndConversation tool	Two-call reflection, durable ended-by-model marker, interactive blocking, headless shutdown, and /clear recovery.	Conversation termination
Headless/SDK mode	-p, --print, --sdk-url, non-TTY stdout, --init-only	Prompt/stdin ingestion, stream-JSON input/output, permission/control frames, JSON/text result output.	Headless streaming and resilience
Prompt/context	CLAUDE.md, .claude/settings.json, --system-prompt, --append-system-prompt, --add-dir, output styles	Runtime instruction sources, memory files, dynamic system prompt sections, slash-command/skill/agent context.	Prompt, context, and memory
Models/auth/providers	ANTHROPIC_API_KEY, ANTHROPIC_AUTH_TOKEN, OAuth token FDs, provider env vars, --model	First-party/OAuth/API key auth, Bedrock/Vertex/Foundry/Anthropic AWS/Mantle provider selection, model aliases, thinking/budget flags.	Models, providers, and auth
Built-in tools and permissions	Tool constants plus --tools, --allowedTools, --disallowedTools, --permission-mode	File, shell, notebook, web, todo, skill, and task tools gated by filters, deny/allow rules, hooks, and permission modes.	Built-in tools and permissions
MCP/plugins/hooks/computer use	mcp, plugin, --mcp-config, --plugin-dir, mcp__computer-use__*, hooks events	MCP config/transport/readiness, hosted discovery, plugin marketplaces/session plugins, hook policy, and macOS application control.	MCP, plugins, and hooks, Computer-use MCP
Settings/policy/integrations	.claude/settings.json, managed settings, --settings, --ide, --chrome	Layered settings, config roots, policy toggles, IDE/Chrome/file integration, API-key helper scripts.	Settings, policy, and integrations
Status-line commands	statusLine, subagentStatusLine, /statusline	JSON stdin state, debounced/periodic refresh, local shell execution, prompt-line rendering, and separate JSONL task-row decoration.	Status line runtime and command protocol
Sessions and transcripts	--continue, --resume, --session-id, JSONL paths	Local transcript roots, latest-session lookup, resume/continue, fork, no-persistence, rewind.	Session resume and transcripts
Cloud/teleport/control	--cloud (deprecated --remote), --teleport, remote-control, --rc, remote token env vars	Hosted session creation/attach, teleport hydration, Remote Control bridge, permission forwarding.	Remote control and teleport
Remote runner data plane	agent proxy, /mnt/user-data/working, /uploads, staged MCP	Policy-enforced HTTPS CONNECT tunneling, tool trust, optimistic working-file sync, filestore staging, and MCP file lanes.	Remote-environment egress and file staging
Hosted projects/artifacts/design/onboarding	CLAUDE_PROJECT_UUID, Projects, Artifact, ClaudeDesign, DesignSync, /team-onboarding	Attached knowledge context and CRUD, versioned hosted pages, collaborative design, guarded design-system sync, and optional onboarding-guide sharing.	Hosted Projects and knowledge, Team onboarding and share flows, Artifact publishing and live pages, Claude Design and design-system sync
Agents and automation	agents, --agents, Agent, CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS, observer, ObserverReport, /fork, /subtask, Workflow, ultrareview, auto-mode	Background sessions, custom agents, background-by-default/nested subagents, experimental Agent Teams/observers, deterministic workflows, and classifier inspection.	Agents, tasks, and subagents, Agent Teams, Observer agents, Dynamic workflows
Diagnostics/ops/media	--debug-file, doctor, update, telemetry env vars, image/audio N-API modules	Debug logs, telemetry and traffic gates, native updater, doctor checks, media module extraction.	Diagnostics and debug logs, Telemetry and tracing, Updater and doctor, Media native modules
Enterprise gateway server	gateway --config <path>	OIDC device login, Postgres state/migrations, provider routing, managed settings, spend administration/metering, OTLP relay, health/readiness, and SSRF/TLS controls.	Enterprise gateway server

Takeaways

The main capabilities in cli.renamed.js can be summarized as: bootstrap, modes, context, models, tools, integrations, sessions, hosted collaboration, remote control, agents, and operations.

More concretely:

1. ZIS(), UkS(), and jkS() form the startup spine: specialized process roles are selected before ordinary Commander parsing.
2. HeadlessRunner/HeadlessControlLoop and InteractiveSessionLoop/InteractiveResumePicker are the two main execution spines: headless/SDK and interactive TUI.
3. McpCoordinator, McpCommandRegistrar, and PluginCommandRegistrar show that MCP and plugins are first-class integration systems, not afterthoughts.
4. Tool-name constants and permission flags show a guarded action runtime around file, shell, notebook, web, todo, skill, and task capabilities.
5. SessionDiscovery, SessionRestore, JSONL transcript roots, ended-by-model, observer-ref, remote tokens, bridge code, and teleport helpers show that durable metadata and remote handoff are core runtime modules. ended-by-model is restored in both direct and picker resume paths; its marker write remains best-effort.
6. ComputerUseMcpServer, TeamOnboardingSkill, and hosted connector/plugin/skill discovery show that integrations can combine local runtime state with separately gated host/account services.
7. The daemon control socket, MCP refresh reducer, and team inbox show explicit trust/failure boundaries: sensitive daemon operations authenticate, failed MCP discovery retains last-good fields, and inbox-delivered permission-rule updates are dropped.
8. Debug/telemetry/update constants and embedded image/audio N-API modules round out the operational and media-support layer.

Use this document as the map; use the linked implementation pages for source anchors and edge cases.